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By three basic units, all
reactive dyes are made up. These three basic units are chromophore, a bridge
and reactive group/groups. To dye cellulosic fibers these dyes are used. Here
formed a covalent bond with hydroxyl group of the fiber by chemically reacting
with fiber when these applied to a cellulosic fiber in an alkaline dye bath.

Types of Reactive Dyes: Basically
reactive dyes are three types which are classified as per the functional group
present,

Mono functional reactive dyes.

Bi functional reactive dyes.

Poly functional or multifunctional reactive dyes.

Properties of Reactive Dyes: The
properties of reactive dyes are given below,